4. Glitch

Glitch is an audio effect plugin for Windows (VST), Mac (VST and AU) and Linux (VST), available in both 32-bit and 64-bit formats. Featuring a new and improved sequencer which can play multiple effects simultaneously, with the ability to trigger unique scenes from every note on your keyboard, Glitch can be as gentle or as brutal as you like.

5. MH Thump Percussive Subharmonic Synth

Thump is a unique audio processor that allows you to synthesize low frequency audio to add low end to a track or generate another sound entirely. Thump looks at the pitch and dynamics of its audio input and uses this information to control its oscillators. You can add low end to drums, augment a bass or even create synthetic drones.

6. Softube — Saturation Knob

The free plug-in Saturation Knob is a modeled output distortion that can be used anywhere you need some grit. Use it to fatten up bass lines, add some harmonics and shimmer to vocals, or simply destroy your drum loop.

9. Tritik — Krush Bit Crusher

With its bit crushing and downsampling algorithms, Krush combines the crispy taste of the digital realm with the warmth of its drive stage and analog modeled resonant filters. A modulation section allows you to quickly add extra life to the sound by modulating any parameter.

10. U-He — Protoverb 1.0

Protoverb is an experimental reverb based on the idea of a "room simulator". Most algorithmic reverbs try to avoid resonances or model the reflections of sound from a rooms walls. Protoverb does the opposite. It builds up as many room resonances as possible, modeling the body of air in the room. It therefore does not need to modulate or colour the signal.

Synths

11. Tytel — Helm Synth

12. Datsounds OBXD

13. Brain Control — TuneFish 4 Synth

Tunefish is a very tiny virtual analog synthesizer. It is developed to fit into about 10kb of compressed machine code while still producing an audio quality that can compete with commercial synthesizers.

14. Dexed – FM Plugin Synth

15. u-he Tyrell N6

Tyrell is the name of a project by the German online magazine Amazona.de. A reader survey and follow-on forum posts provided a pool of ideas for a low-cost HARDWARE analogue synth, which Mic 'Moogulator' Irmer collected and used to develop quite a powerful concept.

16. Togu Audio Line TAL-NoiseMaker

TAL-NoiseMaker is an improved version of TAL-Elek7ro and has a completely new synth engine and a lot of improvements in sound and usability. The synth also includes a small effect section with a reverb, chorus and a simple bit crusher effect.

16. Muon — Tau Bassline

17. u-he Triple Cheese

Winner of the 2006 KVR Developer Challenge, Triple Cheese is a unique-sounding freeware synthesizer plugin. Triple Cheese doesn't use any of the classic synthesis techniques – substractive, FM or additive – but various forms of comb filter i.e. very short chromatically tuned delays. The three cheese modules in a row either generate their own signal, or process the output of the previous module.

18. Ichiro Toda Synth1

19. Tone2 FireBird 2

Firebird is not just another subtractive synthesizer, it uses an innovative synthesis architecture to deliver unique sounds. The interface is very easy to use and allows you to create interesting patches with minimal effort. FireBird comes with 437 build-in sounds.